Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits. Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear [AIIMS 2004]

• A.    If both the assertion and the reason are true and the reason is a correct explanation of the assertion
• B.    If both the assertion and reason are true but the reason is not a correct explanation of the assertion 
• C.    If the assertion is true but the reason is false
• D.    If both the assertion and reason are false
• E.   If the assertion is false but reason is true